When setting the alerts on the event calendar the second alert copies the first alert

When I'm sitting in the alerts on the event calendar and I put one day alert as the first alert, and two hours for the second alert it just copies what's in the first alert, and if I change what's in the first alert it puts wit when I'm sitting the alerts on the event calendar and I put one-day alert as the first alert, and two hours for the second alert it just copies what's in the first alert, and if I change what's in the first alert it puts what's in the second alert I can't get them to work separately and as I've done upgrades with the iOS it seems to have been a problem because in the beginning it didn't do that when I got this phone which is the 6